#define _CRT_SECURE_NO_WARNINGS 1

class Solution {
public:
    int wiggleMaxLength(vector<int>& nums) {
        int n = nums.size();
        if (n == 1)
            return 1;

        vector<int> f(n, 1);
        vector<int> g(n, 1);

        int ret = 1;
        for (int i = 1; i < n; ++i)
        {
            for (int j = 0; j < i; ++j)
            {
                if (nums[j] > nums[i])
                {
                    f[i] = max(f[i], g[j] + 1);
                }
                else if (nums[j] < nums[i])
                {
                    g[i] = max(g[i], f[j] + 1);
                }
            }

            ret = max(ret, max(g[i], f[i]));
        }

        return ret;
    }
};